在这个需求爆发的节骨眼，电商时代的巨轮也转到了老张面前。
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if (currentStep.type === 'Success' || currentStep.type === 'Failure') {，详情可参考safew官方下载
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But handling that stuff is slow. To calculate a string’s width it can’t call len on the string. Instead it has to pass every character through a state machine.